Derivatives (Earned Income On Derivatives) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Settlement Payments By Hedge Classification And Income Statement Location
Total earned income	$ 46	$ 52	$ 57	$ 70
Derivatives Designated as Hedging Instruments [Member] | Net Investment Income [Member]
Settlement Payments By Hedge Classification And Income Statement Location
Total earned income	0	1	1	1
Derivatives Designated as Hedging Instruments [Member] | Interest Credited to Policyholder Account Balance [Member]
Settlement Payments By Hedge Classification And Income Statement Location
Total earned income	1	6	2	16
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Net Derivative Gains (Losses) [Member]
Settlement Payments By Hedge Classification And Income Statement Location
Total earned income	45	47	61	55
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Policyholder Benefits and Claims [Member]
Settlement Payments By Hedge Classification And Income Statement Location
Total earned income	$ 0	$ (2)	$ (7)	$ (2)